What is a volcano?
A volcano is a mountain that opens downward to a pool of molten rock below the surface of the earth. When pressure builds up, eruptions occur. Gases and rock shoot up through the opening and spill over or fill the air with lava fragments.
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Eruptions can cause lateral blasts, lava flows, hot ash flows, mudslides, avalanches, falling ash and floods. Volcano eruptions have been known to knock down entire forests.
An erupting volcano can trigger tsunamis, flash floods, earthquakes, mudflows and rockfalls. How are volcanoes formed? Volcanoes are formed when magma from within the Earth's upper mantle works its way to the surface. At the surface, it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt, it will get bigger and bigger.
STEP 4. MAKE A RESEARCH PAPER OUTLINE. A research paper basically has the following structure: Title Page (including the title, the author’s name, the name of a. Creating an Action Plan for Academic Essay Writing. View Worksheet. Writing an academic essay is much easier when you create an action plan that involves careful. JEL Classification Codes Guide. The guide provides JEL Code application guidelines, keywords, and examples of items within each classification. A business plan is a written description of your business's future, a document that tells what you plan to do and how you plan to do it. If you jot down a paragraph.
What are the different stages of volcanoes? Scientists have categorized volcanoes into three main categories: An active volcano is one which has recently erupted and there is a possibility that it may erupt soon. A dormant volcano is one which has not erupted in a long time but there is a possibility it can erupt in the future.
Why do volcanoes erupt? The Earth's crust is made up of huge slabs called plates, which fit together like a jigsaw puzzle. These plates sometimes move. The friction causes earthquakes and volcanic eruptions near the edges of the plates.
The theory that explains this process is called plate tectonics.
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What are plate tectonics? The theory of plate tectonics is a interesting story of continents drifting from place to place breaking apart, colliding, and grinding against each other.
The plate tectonic theory is supported by a wide range of evidence that considers the earth's crust and upper mantle to be composed of several large, thin, relatively rigid plates that move relative to one another. The plates are all moving in different directions and at different speeds.
Sometimes the plates crash together, pull apart or sideswipe each other.
When this happens, it commonly results in earthquakes. To see this animation again, just refresh this page!
This animation shows you what our planet looked like millions of years ago and what it looks like now! Geology Department at University of California, Berkeley. Cinder cones are circular or oval cones made up of small fragments of lava from a single vent that have been blown into the air, cooled and fallen around the vent.
Composite volcanoes are steep-sided volcanoes composed of many layers of volcanic rocks, usually made from high-viscosity lava, ash and rock debris. Rainier and Mount St. Helens are examples of this type of volcano. Shield volcanoes are volcanoes shaped like a bowl or shield in the middle with long gentle slopes made by basaltic lava flows. Basalt lava flows from these volcanoes are called flood basalts.
The volcanoes that formed the basalt of the Columbia Plateau were shield volcanoes. Lava domes are formed when erupting lava is too thick to flow and makes a steep-sided mound as the lava piles up near the volcanic vent. The eruption of Mount St. Helens in was caused in part by a lava dome shifting to allow explosive gas and steam to escape from inside the mountain.